What is the best description of activities of the tertiary sector?
A) assembling raw materials and manufacturing
B) extraction of materials from the earth
C) provision of services, including wholesaling and retailing, and transportation
D) management of information
E) none of the above
C
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Which of the following is not an example of an age-relationship based on absolute dating?
A) The oldest known rocks on Earth are 3.96 billion years old. B) The Vishnu schist at the bottom of the Grand Canyon is 2 billion years old. C) The dinosaurs became extinct 65 million years ago. D) The Coconino formation in the Grand Canyon is older than the Kaibab formation.
The Enhanced Fujita scale classifies tornadoes according to the ____ of the tornado
a. wind direction b. rotational wind speed c. vertical wind speed d. diameter and height e. length of the path of damage
What are the requirements for a useful guide fossil? What will be an ideal response?
Carcinogens may be difficult to identify and study because ________
A) cancer may be caused by chronic, long-term exposure B) there is no way to measure the carcinogenic potential of a substance C) they are rare in nature D) they are the least common of the toxic substances